Tool retainer



Sept 1, 1931- E. F. TERRY, JR 1,821,732

TOOL RETAINER Filed March 14, 1929 2 Sheets-Sheet l d /gm/a ward/7167i (if 1 1 dill oznaq Sept. 1, 1931. E. F, TERRY, JR

TOOL RETAINER 2 Sheets-Sheet 2 Filed March 14, 1929 \M Z. J

Patented Sept. 1, 1931 UNITED STATES r0012. RETAINER I '1 Application filed March 14, 1923. Serial No. 347,025. i e

The object of the present invention is to provide a novel form of retainer in which the tool-engaging member or yoke has side arms so positioned and held that their line of movement is parallel to that of the steel and substantially in the same plane thereof. Experionce has demonstrated that this produces a very satisfactory structure, in that there is a straight line pull upon the side arms when struck by the collars of the tool.

In the accompanying. drawings:

Figure 1 is a plan view of an embodiment of the present invention.

Figure 2 is a side elevation of the same.

F ignre 3 is a front elevation with portions broken away.

Figure 4 is a sectional view on the line 41- 1 of Figure 2.

Figure 5 is a detail sectional View on the line 5--5 of Figure 1, but illustrating the re tainer in its inactive position.

Figure 6 is a detail sectional View on the line 66 of Figure 1. V

In the embodiment disclosed a tool holder is shown, and designated generally by the reference numeral 6. This, as usual, is connected by side bolts 7 to the front end of a drill and is provided with a socket 8 to receive the shank of a drill steel 9, said steel having a collar 10. The holder 6 is provided at one side of the socket and at its front end with atransverse opening 11, forming a pivot mounting in which is journaled a rock shaft 12 that projects beyond opposite ends of the holder. Said projecting ends are provided with transverse openings 13.

In the openings 13 are stems 14 fixed by suitable pins 15, and carrying heads 16 that are disposed longitudinally of and on opposite sides of the tool holder 6, preferably in the same plane as the socket that receives the steel 9. These heads 16, as shown particularly in Figure 5, are provided with openings 17 therethrough that are counterbored to form sockets 18. A tool-retaining yoke 19 is provided with side arms 20 that pass through the openings 17 and through the sockets 18. In said sockets are coiled springs 21 surrounding the arms 20, abutting at their front ends against the end walls of the sockets and borne heads16-are limited by stop flanges 24 formed ends: of said heads there is EDWARD E. TERRY, an, or DENVER, conch-lino, AssiGNoE"'rojGaE NE- -DE vEE COMPANY, or DENVER, COLORADO, A CORPORATION 0 DELA ARE the sockets 18. The collars 22 areheld in place by nuts 23 on the reai'endsof the arms. The rearwardmovements of the arms lnthe on 'the side arms 20qand abutting the front As will be clear, the yoke '19- can beswung to a position whereit embracesthedrill steel 9 i111 advanceof the collar'lO, and the space within the yoke being less than the diameter of the collar 1 0,the tool '9 is that held against detachment from the holder; On the other hand the yoke, as indicated in Figure 5,, can benswung to aposition where it nolonger isfin thepa'th ofthe'collar 10, whereupon 5131161001 may be removed from the, socket OI: placed therein. Moreover .it will be noted by'reference to-Figures 2- and 3 that whentheiyoke is: in its active position f lo around thefsteel 9, theside arms 20- extend rearwardl'y in parallel relation'td the steeland in "the same plane as said "steel, so that the strain or pull upon the yoke is transmiti5 tedparallel to the steel. In order :ton'esist this strainas itistransmitted to the head 16, the toolholder 6fis= providedwwith outstanding projections 25 recessed as indicated at 26 to form seats for the forwardly projecting fio portions of the head 16. The front walls 26 of these seats are abutted against by the front ends of the head 16, and consequently firm abutments are provided for the heads, so that practically no strain upon the rockshaft 12.

In order to hold the yoke in its operative and inoperative position the device shown in Figure 6 ispreferably employed. The transverse opening 11 intersects a rearwardly eX- 15 0 tending chamber 27 formed in an enlargement 28 on the under side of the tool holder 6. In this chamber is a plunger 29 forced forwardly by a spring 30 behind it and having a stem 31 that projects from the'rear side of the enlargement 28. A dog or pawl 32, pivoted on the plunger 29, has an engage ment in a seat 33 formed in the rear side of the rock shaft 12 and when the rock shaft is turned, obviously this plunger will swingto oppositely inclined positions and thus hold the yoke either in embracement with the tool or in an inactive position.

From the foregoing, it is thought that the construction, operation and many advantages of thehorein -deecribed inventionwill be 3P parent to those skilled in the art without further description, and it will be understood that various changes in the size, shape,

proportion and minor detaiis'of'construction may be resoitedto'without departingfrom the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

15 1. The combination with a tool holder having a-tos'l-mceiving-socket, of a'shaft journaledmntheholder at one side of the socket, tra'nsvelselygdisposed arms carried by the shift and located on' opposite'sides of the holder, said arms having "transversely dis- :pumd openings substantially parallel to and on oppositesides of the-socket in the plane therewith, and a tool-retaining yoke in advance ofthe socket and having side arms extending from points between its upper and lower sides and fsli'dably and yieldingly 'mowited in the openings.

"2. The combination with a tool-holder having a ii'ool receiving socket and a transverse openingat ione sideofthe same, of a rock shaft journaled in thefopeningand having itmnsvemeopeningszin its end, stems engaged "in the openings, iheads on the stems having openings xtherethrough' on opposite sides of thetool' holdena yokeheving side arms slidah-1min :the heads, springs on the arms resisting thesliding movements of the yoke, and :abntments for the heads :formed in the tool ho lder inndva'nce-of theheads and acting i to withstand :the ipullingstrains of the "yoke znnznid heuids.

JIntestimonywhereof, I afiix' my'si'gnature.

F1. TERRY,JR. 

